umm give me that shorter engine life rotary anyday!
80,000 of pure bliss before a rebuild well worth it.
Like a Gothic Savannah Lizard ready to tear off

lighter, more fuel efficient, engine lasts longer

VS

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one of the murdering bastards in black

https://scontent-nrt1-1.xx.fbcdn.net/v ... 530a0c712f78a&oe=5C4D72AE

different class but the hakosuka was too outmatched, heavy etc

re: Mazda's Excellent Killer ... I thought there were some races between the PB110 Excellent and Mazda Capella Rotary. But apparently the Excellent wasn't raced until 1972 when TSA was changed to 1300-1600cc at which time rotary was in the placed in TS-B class where it battle the Skyline 2000

so Excellent PB110 and Mazda rotary did not race together?

from another site

15A engine
The 15A was a variant of the 10A/12A/13B family. The trochoidal dimensions were identical to the 10A/12A/13B engines, but the rotors and their housings were thicker (13B rotor housings are 80mm wide, 15A was 90mm wide).
This engine was more practical than the 21A because it used a lot of components that were readily available for the 10A/12A/13B family.

Displacement per chamber was 737cc (vs a 13B's 654cc). It produced 135hp @ 5750 rpm and 196Nm (145 lb-ft) @ 3500 rpm. The engine was developed around March 1973, but was halted around 6 months later due to the oil crisis. There is one complete engine and several parts kept by Mazda (I believe they are at the Mazda Museum in Hiroshima).


21A engine
The 21A was totally different engine to any other rotary-it shared no parts with the 10A/12A/13B family.
The "trochoidal dimensions" were bigger than the 10A/12A/13B/15A engines (this is illustrated by the size of the 21A rotor shown below) and the rotor housings were also thicker (13B rotor housings are 80mm wide, 21A was 85mm wide).
As it shared no components with the 10A/12A/13B family, this engine was far less practical to produce than the 15A would have been.

Displacement per chamber was 1046cc (vs a 13B's 654cc). It produced 180+ hp and (estimated by torque per cc compared with the 15A engine) about 280Nm (210 lb-ft). The engine was developed around August 1972, (and stopped for the same reason as the 15A) 21A parts are even rarer than 15A, with only one complete engine and a single unmachined rotor.
(Note, the "official name" of this engine was actually the R-II 21A)


22A engine
This was a planned variant of the 21A engine. The rotor housings were designed to be thicker by another 10mm (giving cost savings by using 21A parts). Capacity would have been 1169cc per chamber (vs a 13B's 654cc - almost double!).
Power would have been in the region of 200hp. Unlike the 21A, however, this design was only ever made on paper.
If the engine was made and carried to the same point of development as the 13B family, based on the power output of the 13B-REW a 22A-REW engine would make a stock 455hp!


The widened rotors on both 15a and 21a had some awesome torque figures which the 10 12a and 13b dont

the 15A would have been an awesome R100 Le Mans choice!

"if the R100 came out with a 12a it would have been banned from all forms of racing"

D .. The R100 came out with a 12A factory ?? I swear mine had a 10A in it

They did infact make a 12A triple in the 70,s and you can still buy a new factory create motor as I saw 2 for sale in japan last year. Not sure what it was called. The twin rotor 15A and 21A never got off the ground as far as I know due to seals but the Le Mans you refer to was I think 13 G or j ?? which was a earlier glorified 20B which came out with factory porting.

1 thing I am sure of is that I miss the late 70,s and 80s !!
Heaps less traffic , No speed camera,s and Less cops

Thats the beancounters at Mazda not the designers which wanted to make their own large
limo but like most mazdas in the drawing room those days it took up to 10 years for them
to become reality. A beancounter chose the horrible Kingswood as they would have been cheap
and could make a profit with the empty containers going back to Japan.

Rx2 was heavier and designed earlier but suspension was more expensive than leaf sprung rx3
which was the 808 familia protype which came after the rx2 which there is also a fwd version.
Even the Familia known as the R100 was borrowed from the piston engined body instead of using
the hand crafted cosmos coupe they had to try and make do with what they had for efficiency.

Even if the R100 came out with a 12a it would have been banned from all forms of racing where
the established automotive imperialists could remain dominant.

Mazda should have added one more rotor to the 10a and made it a 15a triple which would have
been even better than a 13b and easy with their alloy sideplates from the cosmo they already had.
All alloy 15a triple would have weighed the same as a 12a or 13b and revved to 12k and would have
won LeMans 24hour race and others just using a 4 speed gearbox.

listen to the triple vs twin on the last run
https://www.youtube.com/watch?v=JcyvTuoslAA

Also small 12a and turbo vs supercar v8
https://www.youtube.com/watch?v=n9Wm4sIEUtI

missed a gear and was impeded from the start but
look at the difference. Would be interesting to
swap the superv8 engine and rotary and try again
as the Ford had no race ballast and prob lighter body
as the Porsche copy FC was darn heavy vs earlier Rx7

> Mazdas 1200 excellent coupe killer

Or "Mazda's killer of the Sunny Excellent PB110 Coupe"?

the RE Sunny Coupe would have been a match for the RX-3 Coupe


Quote:Wheels magazine "Driving the Datsun Rotary"